Airplane sound amplifier



G. w. MOCAULEY ET'AL April 20 1926.

I AIRPLANE SOUND AMPLIFIER Filed Dec. 4, 1924 @MW 77201 a Patented. Apr.20,1926. v

I UNITED STATES --1 ,5s1,5se

PATENT'OFFICE.

GEORGE w. MCCAULEY AND RICHARD w. MACKIE, F HOUSTON, TEXAS.

AIRPLANE somvn AMPLIFIER.

To all whom it may concern: I Be it known that we, GEORGE W. Mo'CAU- LEYand RICHARD W. MACKIE, citizens of the United States, residing atHouston,

Harris County, Texas, have invented a'certain new and useful Improvementin Airplane Sound Amplifiers, of which the following is a specification.

Ourinvention relates to sound amplifiers particularly adapted for use onairplanes. It comprises electrically operated means for amplifying andtransmitting sounds from an airplane for different uses? in commercialpursuits and in warfare.

It is an object of the invention to provide a sound transmitting andamplifying appars.

atus for use upon airplanes which will be capable-of operation inaconvenient mannerfrom the seat in the said airplane.

It is also an object to so arrange the apparatus that it will transmitthe sound most effectively to the earth. It is desired to transmitsounds of all kinds such as signals,- music, spoken words and, if,desired, simply a roar of sound designed to drown out all other sounds.x

Referring to the drawing we have shown an airplane with one embodimentof the invention installed thereon, the parts being illustrateddiagrammatically.

In the drawing we have shown a side View of an airplane of ordinaryconstruction, the representation being to a large extent diagrammatic.The parts of the plane need not be specifically referred to except forthe fact that we contemplate employing a muffier 1 for the exhaust ofthe engine, withthe object in view of doing away with the ordinary noiseof the exhaust during the operation of the airplane. This will make itpossible to more clearly hear the other sounds which it is desired tocommunicate to the earth by the use of our invention.

In addition to the ordinary apparatus we desire to use a small electricgenerator 2 which is to be located preferably on the lower side of thebody of the car, and to be operated through a small propeller 3 operatedby means of the rush of air occurring during the flying of the airplane.This generator may be of any ordinary construction, and will beconnected by means of an electric circuit4 with a'storage battery 5.

As has been previously stated, the purpose of the device Is tocommunicate sounds of any nature from the-airplane to the earth,

but we have shown a device udiereby the spoken words from an operatormay be transmitted. There is therefore a transmitter including amicrophone 0 adj acent the seat of the car, and this microphone isconnected directly with a power amplifier 7. The said amplifier in turnis connected by. electrically conducting wires 8 with the posts 9 and10.

of the loud speakers 11 and 12, respectively. These said loud speakersare connected at the upper ends of horns or megapho'nes and 14 openingon the lower side of the body of the car on the rear of. the passengerseat- The power amplified 7 is connected directly to the battery 5 bymeans of wires 15. A circuit from the battery is also'connected by wires16 with the loud speakers 9 and 10, respectively, as shown in the draw-There are shown two separate loud speakers with the amplifying hornsconnected therewith in the installation disclosed in the drawing. It isunderstood however, that one "or more ofthese loud speakers may be usedto communicate depending upon the conditions obtaining in eachparticular sit-v uation. The loud speakers will be directed downwardlyso that sound communicated thereto will be thrown toward the earth.

Thus a passenger sitting in the seat of the airplane ma speak into thereceiving micro-- phone 6 an the vibrations thus set up will beamplified through the amplified 7 and will be transmitted by means ofthe wires 8 to the loud speakers previously described. This agitationthus set up through the loud speakers will be further amplified andincreased therein .and be thrown downwardly toward the earth in suchvolume that they may be distinctly understood by those below upon theground.

It will be-thus possible to deliver a set speech so that it, may bedistinctly heard, or words, or slogans called out, and for advertisingpurposes or otherwise, or singing or music may be thus communicated. It

will also be obvious that with verylitt-le change the installation willbe adapted to transmitting music from a phonograph or some musicalinstrument, or words or sounds in a code sgquence may be transmitted inthe same manner.

It will therefore be obvious that 'an installation of this kind will beadapted for numerous purposes which .adapt the apparatus for use inmattersof-entertainment, or

for advertising or for communicating messages or signals in time ofwarfare, and for various other purposes. It will be possible to installan apparatus of this kind upon an ordinary airplane with very littlechange in the contruetion of the airplane itself. ,It will therefore beeconomical and cheap to construct, and will have various uses which willbe obvious to thoseskilled in the art without further description.

What we claim as new and desire-to protect by Letters Patent is:

1. A sound transmitting apparatus for airplanes comprising a microphone,a power amplifier connected therewith, a storagebattery, a generatorconnected therewith, a plurahty of downwardly directed loud speakerssecured within the body of the airplane and .OIIIIBCtBdtherewith, andelectrical connections between said batter and said power amplifier, andbetween said attery and loud speakers, and between said power amplifierand said loud speakers for the purpose described.

2.-In combination with an airplaneiuselage, a plurality of funnel-sha edmegaphones directed downwardly an connected integrally to said fuselage,a loud speaker with each said megaphone, a power ampliher and electricalconnections between the same'and a sound producing means.

GEORGE W. McoAULEY. RICHARD W. MACKIE.

